Android Tutorial => Setup and example how to use:

Example

Setup Steps:

Add the following to your project’s main build.gradle

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'me.tatarka:gradle-retrolambda:3.2.3'
    }
}

Now add this to your application module’s build.gradle

apply plugin: 'com.android.application' // or apply plugin: 'java'
apply plugin: 'me.tatarka.retrolambda'

Add these lines to your application module’s build.gradle to inform the IDE of the language level:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

Example:

So things like this:

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        log("Clicked");
    }
});

Become this:

button.setOnClickListener(v -> log("Clicked"));

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